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The schematic below is a reference design for the user to install the photo sensor remotely from
the display.
Reference Design for Remote Photo Diode Brightness Control
Manual Brightness Control
In manual brightness control mode, an externally supplied voltage determines the monitor brightness.
To use manual brightness control mode instead of the default automatic brightness control mode:
1. set pin 4 (/EXT_DIM) of the external dimming connector (J1) to a logic low
2. apply a 0 to 5V analog input to pin 3 (DIM_INPUT) of the external dimming connector
A potentiometer may be used to apply the voltage to the DIM_INPUT, as shown in the figure below.
A 20k pot or higher is recommended. Note that VREF is a 5V regulated voltage supplied through a
470 ohm series resistance.
Important note! Do not connect to pin 2!
Manual brightness control using a potentiometer
LC1502R User's Guide
(020-0315-02B)
17
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